<template>
  <form action="/">
    <van-search
        v-model="searchText"
        show-action
        placeholder="请输入搜索关键词"
        @search="onSearch"
        @cancel="onCancel"
    />
  </form>
  <van-divider content-position="left">已选标签</van-divider>
  <div v-if="activeIds.length===0">请选择标签</div>
  <van-row gutter="16" style="padding: 0 16px">
    <van-tag v-for="tag in activeIds" closeable size="small" type="primary" @close="doclose(tag)">
      {{ tag }}
    </van-tag>
  </van-row>
  <van-tree-select
      v-model:active-id="activeIds"
      v-model:main-active-index="activeIndex"
      :items="tagList"
  />
  <div style="padding: 16px">
    <van-button block type="primary" @click="doSearchResult">搜索</van-button>
  </div>
</template>

<script setup>
  import { ref } from 'vue';
  import { Toast } from 'vant';
  import {useRouter} from 'vue-router';

  const router = useRouter();
  const searchText = ref('');

  const doSearchResult = () => {
  router.push({
    path: '/user/list',
    query: {
      tags: activeIds.value
    }
  })
}

  //已选中的标签
  const activeIds = ref([]);
  const activeIndex = ref(0);
  const originTagList = [
    {
      text: '性别',
      children: [
        { text: '男', id: '男' },
        { text: '女', id: '女' },
      ],
    },
    {
      text: '年级',
      children: [
        { text: '大一', id: '大一' },
        { text: '大二', id: '大二' },
        { text: '大三', id: '大三' },
        { text: '大四', id: '大四' },
      ],
    },
  ];

  //标签列表
  let tagList = ref(originTagList);

  /**
  *  搜索过滤
  * @param val
  */
  const onSearch = (val) => {
    tagList.value = originTagList.map(parentTag =>{
      const tempChildren =  [...parentTag.children];
      const tempParentTag =  {...parentTag};
      tempParentTag.children = tempChildren.filter(item => item.text.includes(searchText.value))
      return tempParentTag;
    })
  };

  //取消  清空
  const onCancel = () => {
    searchText.value = '';
  tagList.value = originTagList;
  };

  // 关闭标签
  const doclose = (tag) => {
    activeIds.value = activeIds.value.filter(item =>{
      return item != tag;
    })
  }

</script>

<style scoped>

</style>